If you run DBCC SQLPERF(LOGSPACE) you should see that the used percentage is low.
run sp_helpdb database name
Then run the following
DBCC SHRINKFILE paste in the log file logical name
that should shrink the files down. bear in mind though, that the log file grows to that size because of data insertions, maintenance etc. The logs will grow again. If you find yourself constantly shrinking database files, I would consider increasing the drive space as you only incur extra IO's when extending the file size.